66944149 has 2 divisors, whose sum is σ = 66944150. Its totient is φ = 66944148.

The previous prime is 66944107. The next prime is 66944161. The reversal of 66944149 is 94144966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58033924 + 8910225 = 7618^2 + 2985^2 .

It is a cyclic number.

It is not a de Polignac number, because 66944149 - 2¹¹ = 66942101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66944749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33472074 + 33472075.

It is an arithmetic number, because the mean of its divisors is an integer number (33472075).

Almost surely, 2^66944149 is an apocalyptic number.

It is an amenable number.

66944149 is a deficient number, since it is larger than the sum of its proper divisors (1).

66944149 is an equidigital number, since it uses as much as digits as its factorization.

66944149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 66944149 is about 8181.9404177738. The cubic root of 66944149 is about 406.0419221920.

The spelling of 66944149 in words is "sixty-six million, nine hundred forty-four thousand, one hundred forty-nine".